Do you put grease on a wheel hub bearing 1998 Chevy blazer?

No, you don't grease a wheel hub bearing on a 1998 Chevy Blazer (or most modern vehicles) in the same way you might grease a bearing in older equipment. The wheel bearings in a 1998 Chevy Blazer are typically sealed and pre-packed with grease at the factory. They are not designed to be repacked with grease.

Attempting to add grease to these sealed bearings can actually damage the seals, leading to premature bearing failure and water intrusion, causing rust and further damage.

If you suspect a problem with your wheel bearing (noise, play, etc.), you should replace the entire bearing assembly, rather than trying to lubricate it.